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यदि $\sin \theta = \frac{12}{13}$ जहाँ $0 < \theta < \frac{\pi}{2}$ और $\cos \phi = -\frac{3}{5}$ जहाँ $\pi < \phi < \frac{3\pi}{2}$ है,तो $\sin(\theta + \phi)$ का मान ज्ञात कीजिए।

$\cos^2 48^{\circ} - \sin^2 12^{\circ}$ का मान ज्ञात कीजिए,यदि $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ है।

यदि $\cos (\alpha + \beta) = \frac{3}{5}$,$\sin (\alpha - \beta) = \frac{5}{13}$ और $0 < \alpha, \beta < \frac{\pi}{4}$ है,तो $\tan (2\alpha)$ का मान ज्ञात कीजिए।

यदि $\cos(\alpha + \beta) = \frac{4}{5}$ और $\sin(\alpha - \beta) = \frac{5}{13}$,जहाँ $0 \le \alpha, \beta \le \frac{\pi}{4}$ है,तो $\tan 2\alpha = $

यदि $\tan A = -\frac{1}{2}$ और $\tan B = -\frac{1}{3}$ है,तो $A + B = $

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